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Employee Benefit Plans Employee Benefit Plans - Employee Stock Purchase Plan, Incentive Bonus Plan and Stock-Based Compensation (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Discounted Price For Purchasing Company's Common Stock | 85.00% |  |
Employee Stock Purchase Plan, Maximum Percent of Annual Compensation | 15.00% |  |
Fair Market Value Of Common Stock Available For Purchase To Eligible Employees Maximum | $ 25,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 143,960 | 164,193 | 112,995
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 11,000,000 | $ 10,700,000 | $ 7,500,000
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ 35,400,000 | $ 40,500,000 | $ 61,600,000
Shares available for grant | 1,200,000 |  |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for future issuance, shares | 2,400,000 |  |
Share-based Payment Arrangement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for future issuance, shares | 4,400,000 |  |

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